package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

public class RefreshTokenInterceptor implements HandlerInterceptor {
    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {

        this.stringRedisTemplate = stringRedisTemplate;
    }


    //进入Control层前的拦截
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        //  1、获取请求头中的Token  authorization
        String token = request.getHeader("authorization");
        System.out.println(token);
        if (StrUtil.isBlank(token)) {
            //4、不存在，拦截
            return true;
        }

        // 2、基于Token获取redis中的用户
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(RedisConstants.LOGIN_USER_KEY + token);
        if (userMap.isEmpty()) {
            return true;
        }

        // 5、将查询到的hash数据转为UserDTO对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);

        // 6、存在，保存用户信息到ThreadLocal
        UserHolder.saveUser(userDTO);

        // 7、刷新token有效期
        stringRedisTemplate.expire(RedisConstants.LOGIN_USER_KEY + token, RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
        //6、放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

        //移除用户
        UserHolder.removeUser();
    }

}
